Surface-acoustic-wave based quantum-well photodetectors

D. H. Huang; G. Gumbs; M. Pepper

doi:10.1117/12.793840

26 August 2008 Surface-acoustic-wave based quantum-well photodetectors

D. H. Huang, G. Gumbs, M. Pepper

Proceedings Volume 7095, Nanophotonics and Macrophotonics for Space Environments II; 70950I (2008) https://doi.org/10.1117/12.793840
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

We develop a dual-charged-fluid model is to explore the surface-acoustic-wave (SAW) dragged photocurrents of one-dimensional (1D) confined-state carriers in a steady state. The proposed model takes into account the quantum confi;nement, the tunneling escape of SAW-dragged 1D carriers, the inelastic capture of two-dimensional continuous-state carriers and the induced self-consistent space-charge field. The numerical results demonstrate a high optical gain due to suppressed recombination of 1D carriers in a region between an absorption strip and a surface gate. Using a discrete model, we calculate the responsivity for the SAW-dragged photocurrent in a quantum well as functions of the gate voltage, photon flux, SAW power and frequency and temperature, respectively. A high responsivity (~10³ Amp/Watt) is shown for high gate voltages and SAW powers, as well as for low photon fluxes and SAW frequencies.

Citation Download Citation

D. H. Huang, G. Gumbs, and M. Pepper "Surface-acoustic-wave based quantum-well photodetectors", Proc. SPIE 7095, Nanophotonics and Macrophotonics for Space Environments II, 70950I (26 August 2008); https://doi.org/10.1117/12.793840

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